In this section we discuss new ideas concerning angular integration in QCD.
We extend the known closed results for massless and single massive two denominator
integrals in \(D\)  dimensions derived
in Refs. [1]}, [2]}, [3]}
to the double massive case.
Furthermore we investigate novel analytic and algebraic properties of angular integrals.
An all-order \(\varepsilon \) -expansion is given for all angular integrals with up to
two denominators. A supplementary geometric picture for partial fractioning is developed
in Appendix 
which provides a new rotational invariant algorithm to reduce the number of denominators
and also proves to be useful for the double massive integral.
